cannot find V4l2 API

["Theodoros V. Kalamatianos" <thkala (at) softlab.ece.ntua.gr>]

On Tue, 7 Mar 2006, Luo Chris wrote:

> Hi,
>
> Here is my problem.
>
> I updated my kernel with V4L2 patch into 2.4.26. After that I try to compile 
> an application based on V4L2. But it seemed that thing did not find the V4L2 
> API in my computer. It turned out the compiling message:
>
> V4L2Device.cc: In static member function `static void
>  V4L2Device::printCapabilities(FILE*, v4l2_capability)':
> V4L2Device.cc:41: error: 'struct v4l2_capability' has no member named 
> 'driver'
> V4L2Device.cc:41: error: 'struct v4l2_capability' has no member named 'card'
> V4L2Device.cc:43: error: 'struct v4l2_capability' has no member named '
>  capabilities'
>
> bla, bla, bla.... The messages was all about V4L2 APIs. It  looked like as if 
> I did not install V4L2 correctly.
>
> So, I update my kernel into 2.6.10. The one has included V4L2 already.
> It turns out the same problem.

That's expected... Applications do not use kernel headers directly, but 
rather the header set glibc was compiled with. If that is really old, new 
features - especially in rapidly evolving subsystems like V4L - are not 
available.

I guess that you can always "persuade" your compiler to use the headers 
from your current kernel, but this can have all sorts of results. A more 
clean solution would be to update your glibc+header packages. Although 
this is also not recommended unless it is accompanied by a full system 
recompile/upgrade...

Personally I would suggest coaxing your compiler to use the raw kernel 
headers from 2.6.x and if that fails (and you really want to compile that 
application) upgrade your distribution. Do not just update the glibc 
packages, unless you can handle random programs breaking here and there 
for no apparent reason...

> here is my modules.conf file discription about V4L. in 2.4.26
>
> conl (at) chris:~/dl/videoserver> cat /etc/modules.conf | grep "video"
> alias char-major-81 videodev

modules.conf has nothing to do with any compilation problems...

I hope this helped...

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